CVE-2026-31981: Nozominetworks Cmc

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A Stored HTML Injection vulnerability was discovered in the Diagram tab and Graph view due to a shared input validation function being insufficiently restrictive. An authenticated user with administrative privileges can inject malicious HTML tags into N2OS configuration data through multiple input vectors. When a victim views the affected data in the Diagram tab and Graph view, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

Affected products

• Nozominetworks Cmc: before 26.2.0 (fixed in 26.2.0)
• Nozominetworks Guardian: before 26.2.0 (fixed in 26.2.0)

Published 2026-07-09. Last modified 2026-08-11.